Magneto magnet



May 3, 1949. H. GoLDBx-:RG 2,469,196

-MAGNETO MAGNET Filed Jan. 4, 1946 2 Sheets-Sheet 1 HMM Patented May 3, 1949 MAGNETO MAGNET Harry Goldberg, Chicago, lll., assignor, by mesne assignments, to Pioneer Gen-E-Motor Corporation, Chicago, Ill., a corporation of Delaware Application January 4, 1946, Serial No. 639,128

2 Claims.

The invention relates to an improvement in magnetos and has for one purpose to provide an improved magneto structure.

Another purpose is to provide an improved permanent magnet for a magneto structure.

Another purpose is to provide an improved ily wheel structure with a permanent magnet forming an integral part of the wheel.

Other purposes will appear from time to time in the course of the specification and claims.

The invention is illustrated more or less diagramrnatically in the accompanying drawings wherein:

Figure 1 is a vertical section, illustrating a ily wheel with its associated magneto weight.

Figure 2 is a section on the line 2--2 of Figure 1.

Figure 3 is a top view of the permanent magnet employed, and Figure 4 is a side elevation of the magnet shown in Figure 3.

Like parts are indicated by like symbols throughout the speciilcation and drawings,

Referring to the drawings, 2 indicates any suitable base structure having a supporting edge 1 receiving the bottom wall 8 of any suitable engine block, not shown in detail and not of itself forming part of the present invention. 9 indicates a crank shaft mounted in any suitable bearings and including a crank portion l0. II illustrates a starting pulley. I2 is a ily wheel which may include a series of fan blades I3. The ily wheel I2 includes an inwardly extending rim I4 which partially surrounds a space about the crank shaft. I5 indicates a ilnned upper portion of the engine block, Since the details of the engine block and the engine do not of themselves form part of the present invention, they are not herein described or shown in detail.

In considering the magneto structure proper, I employ a permanent magnet I|5 which may be cast in place in the flywheel I 2, or may be received in any suitable recess in the wheel, as shown in Figure 2. Itis to be understood that the ilywheel I2 is of non-magnetic material. A variety of metals may be employed for the permanent mag net. I may, for example, employ an aluminumnickel alloy. A suitable alloy is one known in the trade as Alnico No. 5. The permanent magnet is shown as having two end or pole portions |I5a and ||5b separated by a depression |I5c. When the parts are cast integrally together, as shown in Figure 2, the magnet may be ilrmly held in position by the transversely extending integral portion I2a of the ily wheel I2. However, any other suitable means may be employed for holding the magnet in permanent position,

Housed within the fly wheel extension Il is the E shaped magneto core ||5 with any suitable coil I|1 surrounding the intermediate arm of the E shaped core. The coil is mounted on any suitable frame or support ||8 which is mounted on hub extensions I I9 of the plate 24.

The crank shaft 8 is provided with a raised cam portion |20 which may be part of the crank shaft or a separate added part. The object is to reduce wear on the plunger |2I, permitting the plunger to run free of the crank shaft for approximately 330 degrees, thus reducing wear. The breaker plunger |2| is mounted on or controls the breaker lever |23 which carries the point |24 opposed to the opposite contact or point |25. |26 is any suitable condenser. It is advantageous to tilt the fixed magneto structure shown in Figure 2, in relation to the horizontal, to an angle which may be as high as 45 degrees. This prevents oil leakage collecting on the breaker points and resultant contamination.

For the permanent magnet I may use an alloy of aluminum, nickel and cobalt, which use gives us, for the amount of material, great magnetic strength, and consequently improvement in magneto performance. However, other metals may be employed, The employment of metal of the general characteristic of the above alloy permits the use of a smaller permanent magnet or insert than has in the past been possible. Note that the permanent magnet extends about an arc of the order of about 15 degrees, more or less, and preferably substantially less than 45 degrees. The number of lines oi' flux has been increased and the result is a hotter spark, making starting much easier than in previously conventional magneto ily wheel designs.

It will be realized that, whereas, I have described and illustrated a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition o i' parts without departing from the spirit of the invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting me to my precise showing.

I'claim:

1. In combination, a fly wheel of non-magnetic cast metal having a laterally projecting flange, a one piece bar magnet embedded in cast relationship within the inner face of the flange, there being two cylindrical pole faces on one side of the bar magnet one adjacent each end thereof, said faces being exposed in the inner periphery of the flange and of substantially greater area than the cross-sectional area of said magnet intermediate its ends, a bridge cast integral with the flange extending across the body of the magnet between and separating the pole faces, the width of the bridge being substantially greater than its radial thickness.

2. In combination, a fly wheel of non-magnetic cast metal having a laterally projecting flange, a one piece bar magnet embedded in cast relationship within the inner face of the flange, there being two cylindrical pole faces on one side of the bar magnet one adjacent each end thereof, said faces being exposed in the inner periphery of the flange and of substantially greater area than the cross-sectional area of said magnet intermediate its ends, a bridge cast integral with the flange extending across the body of the magnet between and separating the pole faces, the width of the bridge being substantially greater than its radial thickness, the inner peripheral surfaces of the bridge and the flange adjacent the magnet being concentric with and aligned with the pole faces.

HARRY GOLDBERG.

REFERENCES CITED The following references are of record ln the ille of this patent:

UNITED STATES PATENTS OTHER REFERENCES Publication-page 1 of technical pamphlet entitled, Permanent Magnets Have Four Major Jobs, by Charles A. Maynard, Indiana Steel Products Company, 6 North Michigan Avenue, Chicago, Ill., reprinted from Electrical Manufacturi118. Nov. 1944. 

